Common: Add scope_exit.h

This commit is contained in:
MerryMage 2016-07-04 14:56:41 +08:00
parent ce631ac4de
commit be1c1de552
2 changed files with 43 additions and 0 deletions

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@ -16,6 +16,7 @@ set(HEADERS
logging/log.h logging/log.h
memory_util.h memory_util.h
mp.h mp.h
scope_exit.h
string_util.h string_util.h
x64/abi.h x64/abi.h
x64/cpu_detect.h x64/cpu_detect.h

42
src/common/scope_exit.h Normal file
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@ -0,0 +1,42 @@
// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <utility>
namespace detail {
template <typename Func>
struct ScopeExitHelper {
explicit ScopeExitHelper(Func&& func) : func(std::move(func)) {}
~ScopeExitHelper() { func(); }
Func func;
};
template <typename Func>
ScopeExitHelper<Func> ScopeExit(Func&& func) { return ScopeExitHelper<Func>(std::move(func)); }
}
#define CONCAT2(x, y) DO_CONCAT2(x, y)
#define DO_CONCAT2(x, y) x ## y
/**
* This macro allows you to conveniently specify a block of code that will run on scope exit. Handy
* for doing ad-hoc clean-up tasks in a function with multiple returns.
*
* Example usage:
* \code
* const int saved_val = g_foo;
* g_foo = 55;
* SCOPE_EXIT({ g_foo = saved_val; });
*
* if (Bar()) {
* return 0;
* } else {
* return 20;
* }
* \endcode
*/
#define SCOPE_EXIT(body) auto CONCAT2(scope_exit_helper_, __LINE__) = detail::ScopeExit([&]() body)